Question

A cloth is tightly wrapped round the arm at point Z and the veins stand out clearly. One finger presses on the vein at W. When another finger strokes the vein, as shown in the diagram, the vein lies flat between points W and Y @ Some possible explanations are fisted. 1 The bandage at Z prevents backliow of blood 2 The finger pressed al W prevents more blood entering the vein 3 A valve at Y prevents backflow A valve at Z provents more blood from entering the vein 4 Which explanations of the vein lying flat are correct? A 1 and 2 B 1 and 4 C 2 and 3 D 2 and 4​

Answer 1

Answer:

When another finger strokes the vein, as shown in the diagram, the vein lies flat between points W and Y